Answer: Speed is called a scalar quantity because it has only magnitude and no direction.
Explanation: Scalar quantities are defined by a single value (magnitude) and do not involve direction. Speed measures how fast an object is moving, expressed in units such as meters per second (m/s). In contrast, velocity is a vector quantity that includes both speed and direction. For example, saying “the car is moving at 60 km/h” provides only the speed, while “the car is moving at 60 km/h to the north” specifies the velocity. Thus, speed is classified as a scalar because it lacks directional information.